Kim K reveals her secret for preventing wrinkles

Kim Kardashian is known for her selfies – sure she went out and created her own book based on them – but the one thing we noticed in all of them was her lack of smiling.

And now she has revealed why. Far from not being happy, the 34-year-old admitted in a post on Twitter that she doesn't smile too often because it "causes wrinkles."

The reality star took to the social media site to share a stunning picture of her laughing and wrote: "'See I do smile… even laugh on occasion. Not too often though because it causes wrinkles @shammaurice,"